Great deal, you'd be retarded to pass that up. The c6 are great pants. I like the design of the c7 a bit more but they don't seem to be as well made as the c6.
I've only owned my c7s for a few months and the ends of the material is starting to fray. The fraying hasn't reached any seams and I'm not sure it will cause of the heavy stitch but it's been quite annoying to keep cutting or burning threads off them. I've also seen many other pairs of c7 do the same thing.
My c6 on the other hand didn't do that at all. If they didn't have a hole in the knee they'd be in better condition then the c7 and I wore them for over 2 years.